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首页> 外文期刊>IEEE Transactions on Industrial Electronics >Effect of Third Harmonic Flux Density on Cogging Torque in Surface-Mounted Permanent Magnet Machines
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Effect of Third Harmonic Flux Density on Cogging Torque in Surface-Mounted Permanent Magnet Machines

机译：三次谐波磁通密度对表面贴装永磁电机齿槽转矩的影响

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Cogging torque, inherent in permanent magnet machines, is closely related to the airgap flux density harmonic contents. The third harmonic can be utilized in combination with the fundamental one to increase the average torque, whilst its relationship with cogging torque is uncertain. The aim of this paper is to investigate the effect of third harmonic in airgap flux density on cogging torque in surface-mounted permanent magnet (SPM) machines considering different slot/pole (S/P) combinations. First, based on the simplified expressions of cogging torque in machines with sinusoidal plus third harmonic (Sine+3rd) airgap flux density, S/P combinations are classified into four cases for discussion. It is found that when N-s/GCD (N-s, N-p) >= 4 (N-s: slot number; N-p: pole number; GCD: great common divisor), third harmonic in airgap flux density has no effect on cogging torque. Otherwise, cogging torque will be generated. Furthermore, two approaches for obtaining the Sine and Sine+3rd airgap flux density, i.e., Sine/Sine-+3rd h(m), and Sine/Sine+3rd B-r, are validated, based on which finite-element analyses are carried out on four machines, i.e., 12-slot/10-pole (12S12P), 12S6P, 12S8P, and 12S10P to verify the conclusion. Finally, the 12S8P and 12S10P Sine+3rd SPM machines are prototyped and tested for validation.
机译：永磁电机固有的齿槽转矩与气隙磁通密度谐波含量密切相关。三次谐波可以与基本谐波结合使用，以增加平均转矩，而与齿槽转矩的关系不确定。本文的目的是研究考虑不同缝隙/磁极（S / P）组合的表面安装式永磁（SPM）机器中气隙磁通密度的三次谐波对齿槽转矩的影响。首先，基于具有正弦波和三次谐波（Sine + 3rd）气隙通量密度的电机中齿槽转矩的简化表达式，将S / P组合分为四种情况进行讨论。发现当N-s / GCD（N-s，N-p）> = 4（N-s：槽数; N-p：极数; GCD：大公约数）时，气隙磁通密度的三次谐波对齿槽转矩没有影响。否则会产生齿槽转矩。此外，验证了两种用于获取正弦和正弦+3气隙通量密度的方法，即正弦/正弦-+ 3rd h（m）和正弦/正弦+ 3rd Br，在此基础上进行了有限元分析在四台机器上（即12槽/ 10极（12S12P），12S6P，12S8P和12S10P）上进行验证。最后，对12S8P和12S10P Sine + 3rd SPM机器进行原型设计并进行验证测试。

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